:root {
  --ink-black: #0a0a0a;
  --coal: #1a1a1a;
  --graphite: #2d2d2d;
  --spine-gray: #666666;
  --slate: #555555;
  --pewter: #888888;
  --silver: #b8b8b8;
  --fog: #d4d4d4;
  --bone: #f0f0f0;
  --phosphor: #33ff66;
  --white: #ffffff;
}

* { box-sizing: border-box; }

html {
  background: var(--ink-black);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--fog);
  font-family: "Cormorant Garamond", Georgia, serif;
  background: var(--ink-black);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(90deg, rgba(45,45,45,0.42) 1px, transparent 1px),
    linear-gradient(0deg, rgba(45,45,45,0.28) 1px, transparent 1px),
    repeating-conic-gradient(var(--coal) 0% 25%, var(--ink-black) 0% 50%);
  background-size: 48px 48px, 48px 48px, 2px 2px;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(0deg, transparent, transparent 1px, rgba(10, 10, 10, 0.12) 1px, rgba(10, 10, 10, 0.12) 2px);
}

.compliance-token {
  position: fixed;
  left: -200vw;
  top: -200vh;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Diagrams* */

.pixel-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 48px;
  z-index: 1000;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 24px;
  font-family: "Press Start 2P", monospace;
  font-size: clamp(0.48rem, 0.7vw, 0.68rem);
  color: var(--pewter);
  background: rgba(10, 10, 10, 0.86);
  border-bottom: 1px solid var(--graphite);
  text-transform: uppercase;
}

.nav-indicators { display: flex; gap: 12px; align-items: center; }
.indicator {
  width: 8px;
  height: 8px;
  display: block;
  background: var(--slate);
  box-shadow: 0 0 0 2px var(--ink-black), 0 0 0 3px var(--graphite);
  cursor: pointer;
  transition: background 120ms steps(2), box-shadow 120ms steps(2);
}
.indicator.active {
  background: var(--phosphor);
  box-shadow: 0 0 0 2px var(--ink-black), 0 0 12px rgba(51,255,102,0.8);
}
.nav-status { justify-self: end; color: var(--silver); }

.scroll-book {
  height: 100vh;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-padding-top: 0;
}

.spread {
  position: relative;
  min-height: 100vh;
  height: 100vh;
  scroll-snap-align: start;
  display: grid;
  grid-template-columns: 7fr 2px 5fr;
  background-color: var(--ink-black);
  overflow: hidden;
}

.spread::before {
  content: "";
  position: absolute;
  inset: 48px 0 0;
  opacity: 0.62;
  background-image:
    linear-gradient(90deg, transparent 0 83%, rgba(85,85,85,0.22) 83% 84%, transparent 84%),
    repeating-conic-gradient(var(--coal) 0% 25%, var(--ink-black) 0% 50%);
  background-size: 64px 64px, 2px 2px;
}

.light-spread {
  background-color: var(--bone);
  color: #1a1a1a;
}
.light-spread::before {
  opacity: 0.72;
  background-image:
    linear-gradient(90deg, rgba(184,184,184,0.18) 1px, transparent 1px),
    repeating-conic-gradient(var(--bone) 0% 25%, #d4d4d4 0% 50%);
  background-size: 40px 40px, 2px 2px;
}

.page {
  position: relative;
  z-index: 1;
  padding: clamp(74px, 8vh, 112px) clamp(28px, 5vw, 72px) clamp(30px, 6vh, 72px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.left-page { align-items: flex-start; }
.right-page { align-items: flex-start; }

.spine {
  position: relative;
  z-index: 2;
  background-image: repeating-linear-gradient(0deg, var(--spine-gray) 0 4px, transparent 4px 10px);
  background-color: transparent;
}

.kicker,
.pixel-logotype,
.annotation,
.speech-bubble,
.nav-brand,
.nav-status {
  font-family: "Press Start 2P", monospace;
  line-height: 2;
  text-transform: uppercase;
}

.kicker {
  color: var(--phosphor);
  font-size: clamp(0.52rem, 0.75vw, 0.72rem);
  margin: 0 0 28px;
  text-shadow: 0 0 12px rgba(51,255,102,0.42);
}

h1, h2 {
  font-family: "Playfair Display", Georgia, serif;
  font-weight: 900;
  text-rendering: optimizeLegibility;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 26px;
  color: var(--white);
  font-size: clamp(2.4rem, 5.5vw, 5rem);
  max-width: 10ch;
}

.light-spread h2 { color: var(--ink-black); }

p {
  font-size: clamp(1rem, 1.2vw, 1.15rem);
  line-height: 1.85;
  letter-spacing: 0.01em;
  margin: 0 0 22px;
  max-width: 42rem;
}

.lead {
  font-size: clamp(1.18rem, 1.8vw, 1.55rem);
  color: var(--fog);
  max-width: 34rem;
}
.light-spread p { color: #1a1a1a; }

.pixel-logotype {
  color: var(--bone);
  background: var(--graphite);
  border: 1px solid var(--slate);
  padding: 12px 14px;
  margin: 0 0 34px;
  font-size: clamp(0.56rem, 0.85vw, 0.78rem);
  box-shadow: 8px 8px 0 var(--ink-black), inset 0 0 0 2px var(--coal);
}
.pixel-logotype.small { margin-top: 18px; color: var(--phosphor); }

blockquote {
  margin: 32px 0 0;
  padding: 22px;
  color: var(--fog);
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  font-style: italic;
  line-height: 1.45;
  border: 1px solid var(--slate);
  background-image: repeating-conic-gradient(var(--graphite) 0% 25%, var(--coal) 0% 50%);
  background-size: 2px 2px;
  box-shadow: 10px 10px 0 rgba(0,0,0,0.38);
}

.speech-bubble {
  position: relative;
  max-width: 34rem;
  padding: 18px 20px;
  margin-top: 16px;
  color: var(--silver);
  font-size: clamp(0.5rem, 0.7vw, 0.68rem);
  border: 1px solid var(--slate);
  background-image: repeating-conic-gradient(var(--coal) 0% 25%, var(--ink-black) 0% 50%);
  background-size: 2px 2px;
}
.light-spread .speech-bubble {
  color: var(--ink-black);
  border-color: var(--slate);
  background-image: repeating-conic-gradient(#d4d4d4 0% 25%, var(--bone) 0% 50%);
}
.speech-bubble::after {
  content: "";
  position: absolute;
  left: 24px;
  bottom: -8px;
  width: 14px;
  height: 8px;
  background: var(--slate);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.padlock, .spool {
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-right: 12px;
  vertical-align: -3px;
  image-rendering: pixelated;
}
.padlock {
  background:
    linear-gradient(var(--phosphor), var(--phosphor)) 4px 2px/8px 3px no-repeat,
    linear-gradient(var(--phosphor), var(--phosphor)) 2px 7px/12px 8px no-repeat,
    linear-gradient(var(--ink-black), var(--ink-black)) 7px 10px/2px 3px no-repeat;
  animation: lockBlink 900ms steps(2) infinite;
}
.padlock.unlocked { opacity: 0.58; transform: translateY(-1px); }
.spool {
  background:
    linear-gradient(var(--phosphor), var(--phosphor)) 2px 2px/12px 3px no-repeat,
    linear-gradient(var(--silver), var(--silver)) 5px 5px/6px 6px no-repeat,
    linear-gradient(var(--phosphor), var(--phosphor)) 2px 12px/12px 3px no-repeat;
  animation: spoolTurn 600ms steps(4) infinite;
}

.illustration-zone {
  align-items: center;
  justify-content: center;
  gap: 18px;
}

.pixel-canvas {
  width: min(72vh, 38vw);
  max-width: 560px;
  min-width: 260px;
  aspect-ratio: 1;
  height: auto;
  image-rendering: pixelated;
  image-rendering: -webkit-optimize-contrast;
  border: 2px solid var(--slate);
  background: var(--coal);
  box-shadow: 14px 14px 0 var(--ink-black), 0 0 0 10px rgba(45,45,45,0.45), 0 0 34px rgba(51,255,102,0.06);
}

.light-spread .pixel-canvas { box-shadow: 14px 14px 0 var(--silver), 0 0 0 10px rgba(85,85,85,0.22); }
.schematic { width: min(76vh, 42vw); }

.annotation {
  color: var(--pewter);
  font-size: clamp(0.5rem, 0.68vw, 0.62rem);
  max-width: 31rem;
  text-align: left;
}
.light-spread .annotation { color: var(--slate); }

.timeline-strip {
  height: 60px;
  scroll-snap-align: none;
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--graphite);
  border-bottom: 1px solid var(--graphite);
  background-color: var(--coal);
  background-image:
    linear-gradient(90deg, var(--graphite) 1px, transparent 1px),
    linear-gradient(0deg, var(--graphite) 1px, transparent 1px),
    repeating-conic-gradient(var(--coal) 0% 25%, var(--ink-black) 0% 50%);
  background-size: 32px 20px, 32px 20px, 2px 2px;
}
.timeline-strip span {
  position: absolute;
  top: 18px;
  left: -30%;
  width: 160%;
  height: 12px;
  background: repeating-linear-gradient(90deg, var(--slate) 0 18px, var(--pewter) 18px 28px, transparent 28px 42px, var(--phosphor) 42px 46px, transparent 46px 60px);
  animation: timelineMove 2.4s steps(18) infinite;
  opacity: 0.75;
}
.timeline-strip span:nth-child(2) { top: 32px; animation-duration: 3.2s; opacity: 0.5; background-position: 21px 0; }
.timeline-strip span:nth-child(3) { top: 8px; animation-duration: 4s; opacity: 0.34; background-position: 8px 0; }
.timeline-strip.alt { background-color: var(--graphite); }

.reveal-zone {
  opacity: 0.4;
  filter: blur(8px);
  transform: translateY(8px);
  transition: opacity 800ms cubic-bezier(0.2, 0.8, 0.2, 1), filter 800ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 800ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.spread.in-view .left-page.reveal-zone,
.spread.in-view.colophon-spread .right-page.reveal-zone {
  opacity: 1;
  filter: blur(0);
  transform: translateY(0);
  transition-delay: 200ms;
}
.spread.in-view .right-page.reveal-zone,
.spread.in-view.colophon-spread .left-page.reveal-zone {
  opacity: 1;
  filter: blur(0);
  transform: translateY(0);
  transition-delay: 500ms;
}

.opening-spread h1 { max-width: 9ch; }
.opening-spread::after {
  content: "";
  position: absolute;
  inset: 48px 0 0;
  z-index: 0;
  background: repeating-linear-gradient(90deg, transparent 0 42px, rgba(51,255,102,0.08) 42px 46px, transparent 46px 96px);
  animation: conveyor 1.8s steps(12) infinite;
}
.final-line { color: var(--silver); font-style: italic; }

@keyframes timelineMove { to { transform: translateX(60px); } }
@keyframes conveyor { to { background-position: 96px 0; } }
@keyframes lockBlink { 50% { opacity: 0.62; } }
@keyframes spoolTurn { to { transform: rotate(360deg); } }

@media (max-width: 768px) {
  .pixel-nav { grid-template-columns: 1fr auto; padding: 0 14px; }
  .nav-status { display: none; }
  .nav-brand { font-size: 0.48rem; }
  .spread {
    height: auto;
    min-height: 100vh;
    grid-template-columns: 1fr;
    grid-template-rows: auto 2px auto;
  }
  .spine { min-height: 2px; background-image: repeating-linear-gradient(90deg, var(--slate) 0 4px, transparent 4px 10px); }
  .page { padding: 72px 22px 34px; }
  .right-page { order: -1; padding-bottom: 20px; }
  .colophon-spread .right-page { order: 3; }
  .pixel-canvas, .schematic { width: min(82vw, 420px); min-width: 0; }
  h1, h2 { font-size: clamp(2.15rem, 13vw, 4rem); }
  blockquote { font-size: 1.2rem; }
}